Remove some pub use glob usage

[klutzy]

This patchset removes pub use usage except for test/.
cc #11870

[alexcrichton]

This does not appear to remove support from resolve itself, so can you leave the tests that exercise the functionality of a pub use glob? As long as it's a feature of the language, it needs to continue to be tested.

[klutzy]

Done. (due to quasiquoter, removing pub use glob from language is possible after new snapshot.)

[klutzy]

Fixed previous commits, and add two more commits which completely remove pub use glob from syntax.

[pcwalton]

I'm fine with this, as they were always somewhat broken. I think we should reintroduce them in a working state, if we ever do. Half-broken features don't really befit us going forward.

[SiegeLord]

I find this change not going through the RFC process to be distressing. I have many use cases of this feature which I consider valid, which I outlined in the referenced issue. @nikomatsakis suggested that he had some ideas to fix this... were they shelved? Did he run out of time for them?

[klutzy]

@SiegeLord I'm ok if pub globs are properly fixed later. I just assumed #11870 is "accepted" but maybe not?
I dropped two extra commits (fortunately they are rather trivial).

[nikomatsakis]

to be clear, this PR just removes uses of pub use globs, right?

[klutzy]

@nikomatsakis yep.